Session Size

It is critical to be aware of the impact of HTTP session size on performance.
Performance has an inverse relationship with the size of the session data
that needs to be persisted. Session data is stored in HADB in a serialized
manner. There is an overhead in serializing the data and inserting it as a
BLOB and also deserializing it for retrieval.

Tests have shown that for a session size up to 24KB, performance remains
unchanged. When the session size exceeds 100KB, and the same back-end store
is used for the same number of connections, throughput drops by 90%.

It is important to pay attention while determining the HTTP session
size. If you are creating large HTTP session objects, calculate the HADB nodes
as discussed in Tuning HADB.